aboutsummaryrefslogtreecommitdiff
path: root/nx-X11/extras/Mesa_6.4.2/progs/tests/invert.c
blob: 750592ed79f2efd71c3e8e2d1761b15b716642d3 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
/*
 * (C) Copyright IBM Corporation 2005
 * All Rights Reserved.
 *
 * Permission is hereby granted, free of charge, to any person obtaining a
 * copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation
 * on the rights to use, copy, modify, merge, publish, distribute, sub
 * license, and/or sell copies of the Software, and to permit persons to whom
 * the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice (including the next
 * paragraph) shall be included in all copies or substantial portions of the
 * Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NON-INFRINGEMENT.  IN NO EVENT SHALL
 * VA LINUX SYSTEM, IBM AND/OR THEIR SUPPLIERS BE LIABLE FOR ANY CLAIM,
 * DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
 * OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
 * USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

/**
 * \file invert.c
 * 
 * Simple test of GL_MESA_pack_invert functionality.  Three squares are
 * drawn.  The first two should look the same, and the third one should
 * look inverted.
 *
 * \author Ian Romanick <idr@us.ibm.com>
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <GL/glut.h>

#include "readtex.h"

#define IMAGE_FILE "../images/tree3.rgb"

static int Width = 420;
static int Height = 150;
static const GLfloat Near = 5.0, Far = 25.0;

static GLubyte * image = NULL;
static GLubyte * temp_image = NULL;
static GLuint img_width = 0;
static GLuint img_height = 0;
static GLuint img_format = 0;

PFNGLWINDOWPOS2IPROC win_pos_2i = NULL;


static void Display( void )
{
   GLint err;


   glClearColor(0.2, 0.2, 0.8, 0);
   glClear( GL_COLOR_BUFFER_BIT );


   /* This is the "reference" square.
    */

   (*win_pos_2i)( 5, 5 );
   glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, image );

   glPixelStorei( GL_PACK_INVERT_MESA, GL_FALSE );
   err = glGetError();
   if ( err != GL_NO_ERROR ) {
      printf( "Setting PACK_INVERT_MESA to false generated an error (0x%04x).\n",
	      err );
   }

   glReadPixels( 5, 5, img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
   (*win_pos_2i)( 5 + 1 * (10 + img_width), 5 );
   glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );

   glPixelStorei( GL_PACK_INVERT_MESA, GL_TRUE );
   err = glGetError();
   if ( err != GL_NO_ERROR ) {
      printf( "Setting PACK_INVERT_MESA to true generated an error (0x%04x).\n",
	      err );
   }

   glReadPixels( 5, 5, img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );
   (*win_pos_2i)( 5 + 2 * (10 + img_width), 5 );
   glDrawPixels( img_width, img_height, img_format, GL_UNSIGNED_BYTE, temp_image );

   glutSwapBuffers();
}


static void Reshape( int width, int height )
{
   GLfloat ar = (float) width / (float) height;
   Width = width;
   Height = height;
   glViewport( 0, 0, width, height );
   glMatrixMode( GL_PROJECTION );
   glLoadIdentity();
   glFrustum( -ar, ar, -1.0, 1.0, Near, Far );
   glMatrixMode( GL_MODELVIEW );
   glLoadIdentity();
   glTranslatef( 0.0, 0.0, -15.0 );
}


static void Key( unsigned char key, int x, int y )
{
   (void) x;
   (void) y;
   switch (key) {
      case 27:
         exit(0);
         break;
   }
   glutPostRedisplay();
}


static void Init( void )
{
   const char * const ver_string = (const char * const)
       glGetString( GL_VERSION );
   const float ver = strtof( ver_string, NULL );


   printf("GL_RENDERER = %s\n", (char *) glGetString(GL_RENDERER));
   printf("GL_VERSION = %s\n", ver_string);

   if ( !glutExtensionSupported("GL_MESA_pack_invert") ) {
      printf("\nSorry, this program requires GL_MESA_pack_invert.\n");
      exit(1);
   }

   if ( ver >= 1.4 ) {
      win_pos_2i = (PFNGLWINDOWPOS2IPROC) glutGetProcAddress( "glWindowPos2i" );
   }
   else if ( glutExtensionSupported("GL_ARB_window_pos") ) {
      win_pos_2i = (PFNGLWINDOWPOS2IPROC) glutGetProcAddress( "glWindowPos2iARB" );
   }
   else if ( glutExtensionSupported("GL_MESA_window_pos") ) {
      win_pos_2i = (PFNGLWINDOWPOS2IPROC) glutGetProcAddress( "glWindowPos2iMESA" );
   }
   

   /* Do this check as a separate if-statement instead of as an else in case
    * one of the required extensions is supported but glutGetProcAddress
    * returns NULL.
    */

   if ( win_pos_2i == NULL ) {
      printf("\nSorry, this program requires either GL 1.4 (or higher),\n"
	     "GL_ARB_window_pos, or GL_MESA_window_pos.\n");
      exit(1);
   }

   printf("\nThe left 2 squares should be the same color, and the right\n"
	  "square should look upside-down.\n");
   

   image = LoadRGBImage( IMAGE_FILE, & img_width, & img_height,
			 & img_format );
   if ( image == NULL ) {
      printf( "Could not open image file \"%s\".\n", IMAGE_FILE );
      exit(1);
   }

   temp_image = malloc( 3 * img_height * img_width );
   if ( temp_image == NULL ) {
      printf( "Could not allocate memory for temporary image.\n" );
      exit(1);
   }
}


int main( int argc, char *argv[] )
{
   glutInit( &argc, argv );
   glutInitWindowPosition( 0, 0 );
   glutInitWindowSize( Width, Height );
   glutInitDisplayMode( GLUT_RGB | GLUT_DOUBLE );
   glutCreateWindow( "GL_MESA_pack_invert test" );
   glutReshapeFunc( Reshape );
   glutKeyboardFunc( Key );
   glutDisplayFunc( Display );
   Init();
   glutMainLoop();
   return 0;
}